写文件 python 我想我有 else:count 的问题

Question

Write a function named "internet_histogram" that takes no parameters and does not return a value. There will be a file named "survey.csv" in the testing environment containing survey results as described above (the file has a header line which much be addressed by your code). Write a new file named "histogram.csv" containing 2 columns representing "internet_use,frequency" and no header line that will contain a histogram of the results of responders ages 28 to 29 including the endpoint ages. Your file will have exactly 6 lines with internet_use values of 1-5 corresponding to the intfreq results and 6 for responders who answered 2 to eminuse. Read the survey results file and track how many responders in this age range answered with each of these 6 options and write these counts to your "histogram.csv" file in order of internet_use starting with 1. Example histogram.csv: 1,5 2,7 3,0 4,1 5,2 6,4

my code:

import csv
def internet_histogram():
    count_6 = 0
    count_5 = 0
    count_4 = 0
    count_3 = 0
    count_2 = 0
    count_1 = 0
    with open("survey.csv",'r') as f:
        reader = csv.reader(f)
        with open("histogram.csv", 'w') as g:
            writer = csv.writer(g)
            next(reader)
            for line in reader:
                if int(line[3]) >= 28 and int(line[3]) <= 29:
                    if line[2] != '':
                        if int(line[2]) == 1:
                            count_1 += 1
                        if int(line[2]) == 2:
                            count_2 += 1
                        if int(line[2]) == 3:
                            count_3 += 1
                        if int(line[2]) == 4:
                            count_4 += 1
                        if int(line[2]) == 5:
                            count_5 += 1
            else:
                count_6 = count_6 + 1
                arr = [[1, count_1], [2, count_2], [3, count_3], [4, count_4], [5, count_5], [6, count_6]]
                for i in arr:
                    writer.writerow(i)

output: wrote: "1,26 2,29 3,2 4,3 5,1 6,1 " expected: "1,26 2,29 3,2 4,3 5,1 6,2 "

i think its an issue with the else statement but I'm not quite sure, any help would be greatly appreciated.

Answer 1

The way it's written now you'll always get a count of 1 for the 6 column.
You should indent the else so as to count this case along with the others, but using else would only refer to the last if , so it would count all the cases for which int(line[2]) != 5 , which probably isn't what you're trying to do.
For best python zen explicitness, I would use the following instead of else :

if int(line[2]) not in [1, 2, 3, 4, 5]:
    count_6 += 1

Does that work for you?
Good luck!

Answer 2

Not too well-versed in Python yet myself, but I fixed your program by shifting some indentation here, along with a few other minor changes:

import csv
def internet_histogram():
    count_6 = 0
    count_5 = 0
    count_4 = 0
    count_3 = 0
    count_2 = 0
    count_1 = 0
    with open("survey.csv",'r') as f:
        reader = csv.reader(f)
        with open("histogram.csv", 'w') as g:
            writer = csv.writer(g)
            next(reader)
            for line in reader:
                if int(line[3]) >= 28 and int(line[3]) <= 29:
                    if line[2] != '':
                        if int(line[2]) == 1:
                            count_1 += 1
                        elif int(line[2]) == 2:
                            count_2 += 1
                        elif int(line[2]) == 3:
                            count_3 += 1
                        elif int(line[2]) == 4:
                            count_4 += 1
                        elif int(line[2]) == 5:
                            count_5 += 1
                    else:
                        count_6 = count_6 + 1
                    arr = [[1, count_1], [2, count_2], [3, count_3], [4, count_4], [5, count_5], [6, count_6]]
            for i in arr:
                writer.writerow(i)